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(1.2+1.5+2.3)×(3.1+1.5+2.3)+(2.4+1.5+2.3)×(1.9+1.5+2.3)+(4.2+1.5+2.3)×(3.5+1.5+2.3)如何才能正确的简化这道题

题目详情
(1.2+1.5+2.3)×(3.1+1.5+2.3)+(2.4+1.5+2.3)×(1.9+1.5+2.3)+(4.2+1.5+2.3)×(3.5+1.5+2.3)如何才能正确的简化这道题
▼优质解答
答案和解析
原式=(2.3x1.5)x(1.2+3.1)+(2.3x(1.5)x(2.4+1.9)+(2.3x1.5)x(4.2+3.5)
=(2.3x1.5)x4.3+(2.3x1.5)x4.3+(2.3x1.5)x5.7
=(2.3x1.5)x(4.3+4.3+5.7)
=2.3x1.5x14.3
=49.335.