先说说各题的运算顺序,再计算.20-2.5×4÷8+3.25 1.8×(1.4-0.26÷2)[7.6-5×(0.3+0.9)]÷10&nb
先说说各题的运算顺序,再计算.20-2.5×4÷8+3.251.8×(1.4-0.26÷2)[7.6-5×(0.3+0.9)]÷101÷25+0.28×0.21÷0.49...
先说说各题的运算顺序,再计算.20-2.5×4÷8+3.25 1.8×(1.4-0.26÷2)[7.6-5×(0.3+0.9)]÷10 1÷25+0.28×0.21÷0.49.
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(1)20-2.5×4÷8+3.25
=20-10÷8+3.25
=20-1.25+3.25
=18.75+3.25
=22;
(2)1.8×(1.4-0.26÷2)
=1.8×(1.4-0.13)
=1.8×1.27
=2.286;
(3)[7.6-5×(0.3+0.9)]÷10
=[7.6-5×1.2]÷10
=[7.6-6]÷10
=1.6÷10
=0.16;
(4)1÷25+0.28×0.21÷0.49
=1÷25+0.0588÷0.49
=0.04+0.12
=0.16.
=20-10÷8+3.25
=20-1.25+3.25
=18.75+3.25
=22;
(2)1.8×(1.4-0.26÷2)
=1.8×(1.4-0.13)
=1.8×1.27
=2.286;
(3)[7.6-5×(0.3+0.9)]÷10
=[7.6-5×1.2]÷10
=[7.6-6]÷10
=1.6÷10
=0.16;
(4)1÷25+0.28×0.21÷0.49
=1÷25+0.0588÷0.49
=0.04+0.12
=0.16.
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